Someone who doesn't think for themselves and blindly, unquestioningly believes what they are told, even though it conflicts with their own senses and experiences.
They think 2+2=5 because they are told it does by an "authority figure".
Taken from the novel 1984 scene where Winston is tortured into thinking 2+2=5.
So, 225 is basicallysomething that we are bullied into accepting as true, even though it isn't.